改变空间参考，文本框显示prj文件内容

prj文件的读取是通过IESRISpatialReferenceGEN2接口的ExportToESRISpatialReference2()函数来实现，做法是把prj文件读到缓冲的string中，然后可以通过textBox来显示，以下是完整代码：textBox1和textBox2是两个文本框。

private void SelectSRP_Click(object sender, EventArgs e)
{

ISpatialReferenceFactory3 pSpatialReferenceFactory = new SpatialReferenceEnvironmentClass();
string str = "";

//没有图层就提示加载图层
MainFrm mainFrm1 = System.Windows.Forms.Application.OpenForms[0] as MainFrm;
IMap pMap = mainFrm1.axMapControl1.Map;
if (pMap.LayerCount < 1)
{
MessageBox.Show("请先加载图层！");
return;
}

IFeatureLayer pLayer;
pLayer = pMap.get_Layer(0) as IFeatureLayer;  //实现了从ILayer到IFeatureLayer的跳转,因为有一个共同的类：FeatureLayer
IFeatureClass pFeatureClass;
pFeatureClass = pLayer.FeatureClass;
//接口跳转，从要素类得到数据集,IGeoDataset和IFeatureClass有一个共同的类：FeatureClass
IGeoDataset pGeoDataset;
pGeoDataset = pFeatureClass as IGeoDataset;
//接口跳转，从地理数据集得到GeoDatasetSchemaEdit，IgeoDataset和IGeoDatasetSchemaEdit有一个共同的类：FeatureDataset
IGeoDatasetSchemaEdit pGeoDatasetEdit;
pGeoDatasetEdit = pGeoDataset as IGeoDatasetSchemaEdit;

//按选择的文件来建立空间参考
OpenFileDialog ogeoSRP = new OpenFileDialog();
ogeoSRP.Filter = "坐标参考系(*.prj)|*.prj";
ogeoSRP.InitialDirectory = @"C:\Program Files\ArcGIS\Desktop10.0\Coordinate Systems";
ogeoSRP.Multiselect = false;
ogeoSRP.ShowDialog();
str = ogeoSRP.FileName;
//如果用户没有选择则返回
if (str == string.Empty)
{
return;
}
//选择了投影文件txtBox1上显示投影文件名称
textBox1.Text = System.IO.Path.GetFileNameWithoutExtension(str);
//this"str" for  CreateESRISpatialReferenceFromPRJFile Focuntion
str = System.IO.Path.GetFullPath(str);

if (pGeoDatasetEdit.CanAlterSpatialReference == true)
{
ISpatialReference pSpatialReference = pSpatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(str);
try
{
pGeoDatasetEdit.AlterSpatialReference(pSpatialReference);
MessageBox.Show("改变空间参考成功！目前的空间参考是" + pSpatialReference.Name, "提示");
}
catch (Exception ex)
{
MessageBox.Show("改变空间参考不成功！");
return;
}
//把空间参考的信息写到字符串中
int bytes = 0;
string buffer = null;
IESRISpatialReferenceGEN2 parameterExport = pSpatialReference as IESRISpatialReferenceGEN2;
parameterExport.ExportToESRISpatialReference2(out buffer,out bytes);
//在文本框中显示
textBox2.Text = buffer;
}

//刷新地图
IActiveView pActiveView = pMap as IActiveView;
pActiveView.Refresh();

}

转载请注明出处。